Filtering apparatus.



1 witnesses D. JPKELLY.

FILTEEING APPARATUS. APPLICATION EIILED MAR. 3, 1910. RENEWED JAN. 3, 1912.

1,024,082. Patented Apr. 23, 1912.

%@ m JmzzJAezz EW iflwamfmw uNrrn @TATSES TPATENT rin DAVID J. KELLY, OF SALT LAKE CITY, UTAH, ASSIGNCRTO KELLYiFILTER PRESS COMPANY, OF- SALT LAKE CITY, UTAH, A CORPORATION.

. FILTEBING APPARATUS.

Specification of Letters Patent.

Patented A r. 23,1912.

vApplication filed MarchB, 1910, Serial No. 547,029. Renewed January 3, 1912. Serial No. 669,237.

"To all whom it may concern.

Be it known that I, DAVID J. KELLY, a citizen of the United States, residing at Salt Lake City, in the county of Salt Lake and State of Utah, have invented certain new and useful Improvements in Filtering Apparatus, (Case 13,) of-which the following is a specification.

This invention relates to an apparatus designed to separate one material from another as slimes from which precious metals have vbeen dissolved and the liquid which holds the precious metals in solution.

.WVhile the invention is especially'useful in the filtration of slimes from which the metal contents have been dissolved, as .in the cyanid treatment of ores, I do not limit the present improvements to such type of apparatus for it is quite evident that they will be found useful in the filtration of sugar juice and saccharates, as also in many other fields wherea separation of solids from liquids is to be eifecte'd.

For present purposes, I will assume that the invention is to be-used in connection with a filtering apparatus of substantially the form shown in my prior Patent No. 815,021, dated Mar. 13/06, and 864:,808, date Aug. 27/07, said inyention being in the nature of an addition to the filtering tanks of said patents and being designed to automatically indicate the point to which filtration should proceed; in other words, to indicate the cake thickness on the filter frames, or the medium upon which the solid. material is collected. I

\Vith the above and other objects in view my invention consists of the parts, and the constructions, arrangements and combinations of parts, which I will hereinafter describe" and claim.

In the accompanying drawing forming a part of this specification, the figure represents aperspective view of a filter tank of the closed type with a portion of one head thereof broken away to expose the interiorv ,iposition and operation of the present nn- "proveinents.

The filter tank, A, may be of any appropriate construction and may represent any tank or casing within which filtration is designed to take place. It is preferably a closed tank having end heads,"one of which may be removable, as fully described and claimed in my aforesaid patents. \Vithin like frames shown and described in my former patents, but as these frames, as well as the construction of the tank, form no part of the present invention, such parts are not shown in detail and a more extended reference to them does not seem to be necessary.

The present improvements are designed to provide an attachment or means for automatically indicating the point to which filtration should proceed, or in other words to impart a visual indication to an operator of the cake thickness on the filter medium within the tank. That this object may be attained, I locate within one end of the tank, or some other portion of said tank if desired, a small filter, a, which may be of the pressure filter type and may have any suitable construction, for instance it may be a hollow frame with a foraininous plate, a, or sheet over which a fibrous material, (1?, is

placed and properly secured, said filter ha ing its interior connected with a suitable hollow arm which is represented by the pipes, (Z, connecting with passages is a suitable head, c, and which head has projecting radially from its opposite side a float, 7), of any suitable character. In other words, the filter and the float are at opposite-ends of a and upon this arm is mounted the adjustableweight, On the outer portion of the tank is secured a raduated plate or quadrant, it, over which operates the outer or free end of the arm or pointer, g. The pivot pipe, f, may be connected to a flexible tubing, 2', or other extension by means of which the filtered liquid may be conducted to. any suit-' able point; the filter frames will also be providcd with outwardly extending pipes which 90 pivoted connection, and which connection is which serves as a pivot form outlets for the filtered liquid, as shown at m, and as more fully described in my aforesaid patents.

From thisdescription it'will be apparent that the filter, a, and the float, I), are mounted inside the slimes filter tank and are aflixed to the pivot pipe, said filter and float being upon opposite sides of the pipe as shown whereby any movement of the filter and float will'be communicateddirectly to the pipe, f, and as the pointer is fixed to this pipe it is quite evident that the free end of the pointer will becaused to travel over the graduations on the quadrant or plate, It, to thereby indicate the thickness of the accumulated solid material, which has become caked on the filter.

.It will be understood that the slimes pulp is introduced into the tank, A, in some appropriate manner and that as the tank fills, as described in my aforesaid patent, the fil ter, a, becomes submerged as do the filter frames or the main filters in the tank. As

,pressure is applied to the fluid contents of the tank and filtration proceeds, a cake forms on the filter, a, in the same proportion as on'the main filters, and asthis cake increases in bulk. or thickness, its weight causes the filter to adually swing downwardly about the pipe, 7, as an axis and thereby causethe pointer or arm, g, to swing upwardly in the same proportion as the filter swings downwardly inside the tank. In this manner a cake of definite thickness is automatically indicated as thickness is in direct proportion to the weight.

It is obvious that the weight of the caked material on the filter will vary as the density of the material to be filtered, in which the cake is submerged, varies; that is, a mixture of high specific gravity has a greater buoyant effect than one of less specific gravity and hence a submerged cake weighs less in the denser medium and more in a lighter medium. The float, b, is under the same conditions of submergence as thecaked mate rial on the filter, a, and, therefore, as the float is movable in an opposite direction to the filter, it acts as a compensating balance for the latter. In this manner the pointer will indicate the same end-point irrespective of the density or proportion of solids to liquids in the mixtureto be filtered. The

float is also so proportioned that the effect of the force of buoyancy on the cake is neutralized, and as buoyancy is proportional to the weight 'of displaced liquids the size of the float is made to correspond relatively to the cuoical contents of the desired cake and the distance from the fulcrum. Ordinarily the weight ofthe float is designed to In a denser medium the buoyant effect becomes manifest and is indicated by the pointer, g, on the exterior graduated quadrant. The specific gravity of a-slimes mixture can, therefore, be read necessary to attach the flexible connection, 2',

to a suitable branch from a suction line.communicating with the main filter frame, as will be-readily understood by one skilled. in this art.

Having thus described my inventio. what I claim as new and desire to obtain by Letters Patent is 1. The combination with a filter tank, of a supplemental filter within the same and upon which the solid material accumulates, means connecting with said supplemental filter and operating in the contents of the tank and serving as a compensatingbalance for said filter, and a visual means fer indicating the cake thickness on the suppl emental filter;

2. The combination with a filter tank having a main filter upon which the solid material accumulates, of a supplemental filter within the tank and upon which the solid material also accumulates, a buoyant member connecting with the supplemental filter and operating in the contents of the tank and serving as a compensating balance for the supplemental filter, and a visual indicator on the outside of the tank operated by the supplemental filter and buoyant member for disclosing the thickness of the naked material on said supplemental filter.

3. The combination with a tank having a main filter upon which the solid material accumulates, of a supplemental filter within the tank and upon which the solid material also accumulates, a float connected to move in unison with the supplemental filter, and

a visual indicator on the outside of the tank operated by the rise and fall of the filter and float within the contents of the tank and for indicating the cake thickness on the filters.

4. The combination with a tank having a main filter upon which the solid material accumulates, of a supplemental filter within the tank and submerged therein and upon which the solid material also accumulates, a float connected to move in unison with the supplemental filter, a pipe to which thesupplemental filter and float are connected, said pipe being turnably mounted, a pointer fixed to the pipe outside the tank, and a graduated scale outside the tank over which the free end of the pointer is movable.

5. The combination with a tank having a main filter upon which the solid material accumulates, a pipe turnably mounted in the tank and projecting both inside and outside thereof, a supplemental filter and a float both connected to said pipe inside the tanktiuznable in unison with the pipe, said pipe adapted to communicate with the iuterior of the supplemental filter, upon which latter the solid material also accumulates, a pointer fixed to the-pipe outside the filter, a weight adjustable upon the pointer, and a graduated scale outside the filter over which the free end of the pointer is movable.

6. The combination with a tank having a. main filter upon which the solid material accumulates, a pipe tnrnably mounted in the tank and projecting both inside and outside thereof, a supplemental filter and a float both connected to said pipe inside the tank and turnable in unison with the pipe, said pipe adapted to communicate with the inte-: rior of the supplemental filter, upon which latter the solid material also aeeun'iulates, a pointer fixed to the pipe outside the filter,-a weight adjustable upon the pointer, a graduated scale outside the filter over which the free end of the pointer is movable, and a continuation of the pipe through which the filtered liquid from the supplemental filter may be delivered.

7. A sun tank having a main filter upon which the solid material tICClll'lllllIt'QS in cake form said tank containing a supplemental filter which is submerged in the fluid contents of the tank and is pivotally mount-- ed so that it will sink into said contents as the solid matter thereot' accumulates on said supplemental filter, a float connected to. move with but in an opposlte direction to said supplemental filter, and an indicating means outside the tankand movable in unison with the supplemental filter and adapted to indicate the thickness of the solid matter aecumulated upon the supplemental filter.

In testimony whereof I alfiX my signature in presence of two witnesses.

DAVID J. KELLY.

Witnesses ALBERT L. GENTER. C. B. FELT. 

